Support global pv and pvc management on helm charts

The management of PV and PVC is duplicated or use manually created elements in several parts of the charts:

• graph (pv and pvc management)
• alter (needs the volume to be created before deploying)
• cassandra-checks (PVC management)

For next-version, the functionality is missing to be able to share a volume between rw and ro objstorages without using a host path volume.

Having a global section that allows to create the volumes and the claim would allow to manage the volumes globally for an environment, reduce the duplication, and add more flexibility for the deployment definitions.

The idea is to support the something like:

persistentVolumes:
- pv1:
    <spec>
- pv2:
    <spec>

persistentVolumeClaims:
- claim1:
    <spec> 
- claim2:
    <spec> 

added kubernetes swh-charts labels

it could also be interesting to have this in the cluster components part to have volumes not removed when next-version is undeployed, which is the case for the moment. for the moment, the next-version contents are removed when the environment is undeployed.

Since that's 2 different charts, that mean this will be duplicated in the 2 charts though. But that should be a relatively low maintenance code so it should be fine ("famous last words" :)

changed the description

assigned to @ardumont

mentioned in commit swh/infra/ci-cd/swh-charts@fc837599

mentioned in commit swh/infra/ci-cd/swh-charts@04fa2ebd

mentioned in merge request swh/infra/ci-cd/swh-charts!552 (merged)

mentioned in commit swh/infra/ci-cd/swh-charts@68d194d5

mentioned in commit swh/infra/ci-cd/swh-charts@6a3ee78c

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mentioned in commit swh/infra/ci-cd/swh-charts@37b9d13e

mentioned in commit swh/infra/ci-cd/swh-charts@d77e6a4f

mentioned in commit swh/infra/ci-cd/swh-charts@efed6424

mentioned in commit swh/infra/ci-cd/swh-charts@e5faa7d1

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Deployed.

closed

mentioned in commit swh/infra/ci-cd/swh-charts@33eac1f7

mentioned in commit swh/infra/ci-cd/swh-charts@33eac1f7

mentioned in commit swh/infra/ci-cd/swh-charts@d3ff4a08

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mentioned in commit swh/infra/ci-cd/swh-charts@cac20a8c